Question

question 25
1 pts
the component that distinguishes one nucleotide from another is the
nitrogen base.
phosphate groups.
five - carbon sugar.
hydrogen bond.
question 26
1 pts
if oxygen is available, the pyruvate molecules formed by glycolysis are prepared to enter the next phase of aerobic cellular respiration, called the
electron transport system.
citric acid cycle.
lock and key model.
chemiosmosis cycle.
question 27
1 pts
in which stage of mitosis do chromosomes move to the opposite ends of the cells along the spindle fibers?
anaphase
metaphase
prophase
telophase

Explanation:

• Question 25: Nucleotides have a sugar - phosphate backbone and a nitrogen base. The nitrogen base is what makes one nucleotide different from another. For example, adenine, thymine, guanine, cytosine in DNA and adenine, uracil, guanine, cytosine in RNA are different nitrogen bases.
• Question 26: After glycolysis, when oxygen is present, pyruvate is converted for entry into the citric acid cycle. The citric acid cycle is a key part of aerobic cellular respiration that generates energy - carrying molecules.
• Question 27: In anaphase of mitosis, sister chromatids separate and are pulled to opposite ends of the cell along the spindle fibers.

Answer:

Question 25: nitrogen base.
Question 26: citric acid cycle.
Question 27: anaphase